Power-hammer



(No Model.)

L.-D. HOWARD.

POWER HAMMER.

Patented Jam. 23, 1894.

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UNiTEn STATES LEONARD D. HOWARD, OF ST. J OI-INSBURY, VERMONT.

POWER-HAMMER.

SPECIFICATION forming part of Letters Patent No. 513,326, dated January 23, 1894. Application filed March 16, 1892. Serial No. 425,148. (No model.)

To all whom, it may concern.-

Be it known that I, LEONARD D. HOWARD, a citizen of the United States, residing at St. Johnsbury, in the county of Caledonia and State of Vermont, have invented a new and useful Power-Hammer, of which the following is a specification.

My invention relates to improvements in power hammers in which a vertically reciprocating hammer, operated by a crank works in conjunction with a fixed anvil block; and the objects of my improvement are, first, to provide a cushion between the hammer and crank so as to relieve the same and the mechanism connected therewith from the'jar and shock produced by the hammer.striking the work; second, to afford facilities for adj usting the tension of the springs forming the cushion; and third, to provide means of raising or lowering the hammer for different thicknesses of work. I attain these objects by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a vertical elevation of the en tire machine. Fig. 2 is a detail view showing position of link when hammer is at its highest point. Fig. 3 is a section through center of split sleeve and crank pin. Fig. 4 is a side View of the connecting rod showing where springs are placed. Fig. 5 is a top view of the hammer and guide box showing manner of guiding hammer. Fig. 6 is a section showing collar at end of spring with ball and socket joint by which collar is pivoted to side of lever.

Similar letters refer to similar parts throughout the several views.

The crank plate a. mounted on a counter shaft or mandrel running in suitable boxes attached to the frame; the connecting rod f. attached to crank plate a. by means of crank pin b. and split sleeve u; springs z', i, levers Z, links 771.. and hammer 0. constitute the running parts of the machine. The crank pin 1). is secured by its head to crank plate a. and is adjustable in a radial dovetail slot securing thereby means of lengthening or shortening the stroke of the hammer. On the crank pin is a bushing against which a nut is screwed to tighten the head of the pin in the dovetail slot in crank plate a. Over this bushing is the X shaped split sleeve a. through the upright portion of which is the connection rod f. held in place by clamping bolt 0. The lower end of connection rod f. terminates in a T. forming fulcrums for the two side levers Z. at the top of which is placed the springs 11. v the lower end of levers I). being connected to hammer 0 by means of raw hide links m.

The letter 19 indicates a guide box, provided with angular ways 1" between which the hammer works, the said hammer being grooved on each side for the purpose as shown in Fig. 5. The said box is constructed in two parts which are fastened together by bolts 6 and nuts 8. l

The split sleeve attachment to the crank pin 1). is shown in section in Fig. 3 which also shows in section the bushing heretofore mentioned for clamping the pin in place to crank plate. The vertical half of split sleeve '11.. through which passes connection rod f. is shown in Fig. et; at g. on connection rod f. is a flattened place for the reception of rod h. which passes through collars j, springs vi. 1'. and connection rod f. The levers Z. are provided with a ball where rod it. passes through them and collars j have sockets to fit as shown in Fig. 6 by which springs 1 t'. are kept in line during the several motions caused by the vibrating of connection rod f. The rod 72. passes through collars j. and rodf. at g. and is threaded at each end on which are washers j and nuts to secure the proper tension of sprlngs 'L. c.

I pivot the levers Z. on the fulcrums at bottom of connection rod f. by means of bolts 70.

' The rawhide links 4%. are attached to levers Z. by means of bolts on which are brass or bronze bushings around which the rawhide is placed as shown at 00. Fig. 1. I also connect links m. to hammer o in the same manner. The links m. are made by winding a rawhide strip around the bushings at each end and stitching through the rawhide as shown. I am aware that prior to my invention ham mer springs have been made for vertically reciprocating hammers. I therefore do not claim such a combination broadly, but

What I do claim as my invention, and desire to secure by Letters Patent, is-

1. In a power-hammer, the combination,

situated on the transverse shaft and confined therein by means of collars, substantially as specified.

2. The combination, in a power hammer, with the crank-plate or disk mounted on a revolubly supported shaft, a crank-pin adjustably secured in a radial slot made in said plate or disk, a split sleeve carried by said crank-pin, a connecting-rod having its upper end confined in said sleeve and carrying a transverse shaft, anda pair of levers pivoted to the lower end of said connecting-rod, of a pair of rawhide links connecting said levers with the hammer and a pair of actuating springs located on thetransverse shaft, one spring arranged on each side of theconnecting-rod and adapted to bear against an arm of each connecting-lever, substantially as specified.

3. The combination, in a power-hammer, with the crank-disk and its shaft, revolubly supported, the split sleeve carried by a crank pin adjustably secured to said disk, and a connecting-rod having its upper end confined in the vertical part of said split sleeve and carrying a-transverse shaft, of a pair of levers pivoted to the lower end of said connectingrod, each lever having an upwardly extending arm provided with a ball-like projection, a collar mounted on each arm of the transverse shaft and provided with a socket to receive the ball-like projection on said lever, an actuating-spring arranged on each transverse arm and held against the socketed collar by a collar and nut, and a pair of links connecting the lower ends of the levers with the hammer, substantially as specified. I

LEONARD D. HOWARD. Witnesses:

O. H. JONES, ALBERT HOWE. 

